First thing first,  i would like to inform you that must have at least Processing Artisan 1, and Trading Artisan 2 for the essence of 1st and 7th quest. As of now i have to stopped completing the 5th quest from the grinding part with the fact that:

*Obsidian dust in Soldier's Grave,

*Samoga's Molar in Waragon Nest, 

*Golden Mirage Sulfure mine, and the 

*Red Mercury from Helm post which all of this item drop rate is most likely 0.0001%.

I had to stop from this part with the reason for my curiousity kills the cat. I do not have much sleep time in grind this things(lack of sleep); Imagine RNG give u 2 pcs for between 5hrs and last item will takes your time to loot it(More than a day). 

and the most stupid part being lack of sleep, i accidentally throw one of the item listed above which makes me irritated to finish the event after all.

by the way the best way to finish this event SECRET QUEST CHALLENGE  is someone must finish it first to increase the chance of drop rate of that certain item required for the essence quest. (SILVER REWARD IS REALLY GOOD), After all Health is the most impotant things in this life next is gaming.

For the meantime i will afk fishing for now let someone do this job. 

P.S (I do really Enjoyed the first four part of this secret quest, )